Ratchet-drill.



P. F. ELLMER.

v RATCHET DRILL` l APPLICATION FILED JULY I. 1915- PatentedJan. 4, 1916.

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` P. F. ELLMER.

RATCHET DRILL.

APPLICATION FILED JULY I..I9I5. I v f l v v 1,166,665. Y, I d Patented Jan. 4, 1916.

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PAUL F. ELLMER, ,0E PHILADELPHIA, PENNSYLVANIA.

RATCHET-DRILL.

To all whom it may concern: l

Be it known that I, PAUL F. ELLMER, a

citizen of the United States, residing at` Philadelphia, in the countyl of Philadelphial and State of Pennsylvania, have invented certain new` and usefulV Improvements ,in RatchetfDi-ills, of which the following is a specification.

My invention relates to improvements in ratchet drills, an object of the invention lbe- Y ing to provide a drill of the character stated Y position.

ous novel details of construction, and which consists 1n certaln novel features and comblel nations and arrangements of parts as will be more fully hereinafter described and pointed out in the claims.

InV the accompanying. drawings:` F igure` 1 is a top plan view of my improved drill i illustrating the handle in dotted lines in the L of Fig. 2. Fig. 4 is a viewin transverse position it will assume during the normal operation -of the drill. Fig. V2 `is 'an' enlarged fragmentary view in side elevation. Fig.V 3 is a view in section on the line 3 3 section on the line 4 4 of Fig. 3, the feed screw being shown partly in elevation, and

Fig. 5 lis a fragmentary viewvin section on the line 5-5 of Fig. 3. y

1 represents the spindleof my improved u :A drill which is provided at its lower end with a socketv 2 to receive an ordinary tool 3.

The spindle 1 is of three different diameters,`

the largest portion of the' spindle located at the lower end thereof, the smallest diameter of the spindle at the upper end, and the intermediate diameter midway between the ends of the spindle. These different diameters of spindle provide two annular shoulders 4 and 5 for a purpose whichk will'here-` inafter appear. The lowerend ofthe spindle 1 is made with an integral gear rwheel 6, and a lever 7 is mounted to oscillate on the spindle, and is bifurcated at its end and provided in the two lmembers of said bifur- Specification ofLetters Patent.

Patented Jan. 4, 1916.A

Application led .Tuly 1, 1915. Serial No. 37,482.

cated end witliopenings 8 and 9 respectively,

the latter fittingthe intermediate diameter of the spindle, andthe former the smallest.

diameter ofthe spindle and resting on ythe shoulder 4.v A handle 10 is also mounted on the spindle 1, and is of-general bifurcated form at one end'. One member of the bifur- V cated end of the handle is positioned around the intermediate diameter of the y spindle, and rests in the shoulder 5 between the lever 7 and said shoulder, while the othervmember of said bifurcated end of the handle is lo-` cated around a cylindrical projection 11 von lever 7 as 4shown clearly in Fig. 4. Y

On the intermediate portion of the spindle 1, a ratchet wheel 12 Vis keyed and located in 'thebifurcatedportionsof thelever 7 and "i handle 10. lA springpressed pawl 13 connected to lever 7, land a spring-pressed-pawl 14connected to handle 10, bothengage the ratchet wall12-as shown clearly in Fig.vk 3, so that pawl-14 operates to hold the spindle against movement when pawl 13 is moving backwardly to take a fresh hold.

The upper endfof spindle 1 is made with a screwthreaded socketjl to receive i the feed screw 16, and the latter at its upper end is provided with transverse openings 17 for the admission of 'suitable devices to manually turn the same for quick adjustment on initial positioning, and a removable cone ,N

thrust 18 is supported at they upper end of' the screw, and is of desiredmetal to sustain the wear,and can be replaced when worn.

A gear wheel 19 is keyed tothe upper por tion of the feed screw 16, andsecured in place by a nut 20. In the lever 10, a sleeve"v 21 isV supported to turn, and is provided with an eccentric bearing 22 in which a i shaft 23 is located. This shaft 23 at its upperend has keyedy thereto a gear wheel 24 which meshes/with gear wheel 19, and on the lowery portion of the'shaft 23, a gear wheel 25 is located, and the key 26 of this gear wheel 25 is supportedin a longitudinal groove27 in shaft 23 to permit. the shaft longitudinal movement relative to the gear.

'The gear 25 meshes with gear 6, and as Vshown lclearly inFig.` 5, vboth gears 2 4 and 25 are provided at ,opposite sideswith plates los" 2S which overlap theteeth of the gears', andv insure an intermesliing of the gears during the operation of the drill,- and also preventl gear 25from falling. off of the shaft 23, but allow the shaft to move freely lin the gear as the drill spindle feeds longitudinally.

An arm 29 is secured t0 sleeve 21, and is provided with a holding screw 30 which normally holds thev sleeve in a position to maintain the gears in. mesh, but whenever occasion may require, this arm 29 may be swung in a direction to turn the sleeve 21 and move shaft 23 so as to draw the gears 2% and 25 away from gears 19 and 6, and allow the spindle to be adiusted in order to initially position the drill when the parts can be returned to normal position and the drill operated as will now be described.

rl`he handle l0 is of general U-shape in cross section, so that when the drill is not in use, the handle will lie smoothly against the lever as shown clearly in Fig. 1. l/Vhen, however, the parts are in position for use, the handle l0 is swung to the position shown in dotted lines in Fig. 1, and while the handle is held with one hand, the lever 7 is oscillated with the other hand. As the lever is oscillated, the spindle will be revolved to turn the tool 3. At the same time, through the medium of gears 6 and 25, shaft 22, and gears 24 and 19, the feed screw 1G will be turned so as to feed the spindle downwardly at each oscillation, hence the feed of the spindle will be exactly commensurate with the operation of the tool, and the entire operation will be easily controlled by the handle and the lever. rEhe handle therefore, not only prevents rearward or retrograde movement of the spindle, but it also operates as a holding means to guide the spindle and the drill, and permits a quick accurate drilling operation.

Various slight changes might be made in the general form and arrangement of parts described without departing from my invention, and hence l do not limit myself to the precise details set forth, but consider myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of the appended claims.

Having thus described my invention, what l claim as new and desire to secure by Letters Patent is:

1. 1n a ratchet drill, the combination with a spindle having a ratchet wheel thereon, of a lever mounted to oscillate on the spindle and having a pawl vengaging the ratchet wheel, a handle supported on the spindle and having a pawl engaging the ratchet wheel, an operating screw engaging the upper end of the spindle, and transmission mechanism carried by the lever and transmitting rotary motion from the spindle to the screw, substantially as described.

2. 1n a ratchet drill, the'combination with a spindle having a ratchet wheel thereon, of a lever mounted to oscillate on the spindle and having a pawl engaging the ratchet wheel, a handle having a bifurcated end pivotally mounted on the spindle, and having a pawl engaging the ratchet wheel, an

operating screw engaging the upper end of the spindle, and transmission mechanism carried by the lever and transmitting rotary motion from the spindle to the screw, substantially as described. Y

3. ln a ratchet drill, t-he combination with a spindle having a ratchet wheel thereon, of alever mounted to oscillate on the spindle and having a pawl engaging the ratchet wheel, a handle supported on the spindle and having a pawl engaging the ratchet wheel, a shaft supported in the lever, gear wheels keyed to said shaft, a gear wheel on the spindle engaging with one of said gear wheels, a feed screw operatively engaging the spindle, and a gear wheel on the feed screw meshing with the other of said firstmentioned gear wheels, substantially as described.

l. 1n a ratchet drill, the combination with a spindle having a ratchetXwheel thereon, of a lever mounted to oscillate on the spindle and having a pawl engaging the ratchet wheel, a handle having a bifurcated end pivotally mounted on the spindle, and having a pawl engaging the .ratchet wheel, a shaft supported in the lever, gear wheels keyed to said shaft, a gear wheel on the spindle engaging with one of said gear wheels, a feed screw operatively engaging the spindle, and a gear wheel on the feed screw meshing with the other of said firstmentioned gear wheels, substantially as described.

5. In a ratchet drill, the combination with a spindle having a ratchet wheel thereon, of a lever mounted to `oscillate on the spindle and having a pawl engaging the ratchet wheel, a handle supported on the spindle and having a pawl engaging the ratchet wheel, said handle of general U-shape in cross section and adapted to lie smoothly against the side of the lever, a shaft supported in the lever, gear wheels keyed to said shaft, agear wheel on the spindle engaging with one of said gear wheels, a feed screw operatively engaging the spindle, and gear wheel on the feed screw meshing with the other of said rst-mentioned gear wheels, substantially as described.

6. In a ratchet drill, the combination with a spindle having a ratchet wheel thereon. of end, and a screw-threaded socket in its other and having a pawl engaging the ratchet wheel, a handle having a bifurcated end pivotally mounted on the spindle, and having a pawl engaging the ratchet wheel, said handle of general U-shape in cross section and adapted to lie smoothly against the side of the lever, a shaft supported in the lever, gear wheels keyed to said shaft, a gear wheel on the spindle engaging with one of said gear wheels, a feed screw operatively engaging the spindle, and a gear wheel on the feed screw meshing with the other of 1 said rstmentioned gear Wheels, substantially as described.

7. In a ratchet drill, the combination With a spindle having a gear Wheel adjacent one end, and a screw-threaded socket in its other end, said spindle having a ratchet Wheel thereon intermediate its ends, of a bifurcated lever mounted to oscillate on the spindle and straddling the ratchet Wheel, a bifureated handle pivotally supported on the spindle, spring-pressed pavvls on the lever and on the handle engaging the ratchet Wheel, a feed screw engaging in the threaded socket of the spindle and having a gear Wheel secured thereto, a sleeve mounted to l turn in the lever, a shaft having an eccentric bearing in said sleeve, gear Wheels keyed to the respective ends of the shaft and meshing With the gear Wheels onthe spindle and the feed screw, an arm on said sleeve adaptedv Y to turn the same to move the gears into and PAUL F. ELLMER.

`Witnesses: l

HENRY DoLLER, C. E. Po'r'rs.

Copies of this patent may be obtained for'flve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

